180 PROCEEDINGS OF THE ACADEMY OF [April, 



In some shells the penult whorl does not descend more rapidly than 

 those preceding it. This gives the shell a contour somewhat different. 



This little shell resembles Pyrgulopsis in shape. It also has much 

 in common with Aclis (Amhlyspira) 'prominens Guppy of the Bowden 

 bed, but we can find no columellar plait in that species, which more- 

 over is decidedly larger. 

 Odostomia (Eulimastoma) bathyraphe n. sp. 



The shell resembles 0. pyrgulopsis in umbilicus, surface and 

 general appearance, but differs as follows: The last whorl is more 

 strongly carinate; the whole shell is wider, summit more obtuse, 

 whorls less numerous. The tip of the first whorl is turned in, nuclear 

 whorls being presumably wholly immersed. The suture is deeply 

 channelled from its beginning. 



Length 1.5, diam. 0.8 mm.; 4| whorls. 



Type No. 3091, A. N. S. P. 



As in 0. pyrgulopsis, the columellar plait appears much larger in 

 an oblique view than in the face view drawn in the figures. 

 Odostomia (Evalea?) vexator n. sp. 



The shell is somewhat cylindric but tapers slowly upwards to a 

 very obtuse summit, which turns in at the tip, the nuclear whorls 

 being immersed. Subsequent whorls are flattened, excavated above 

 the suture, very narrowly shouldered below it, with sculpture of 

 fine lines of growth and numerous (about 15 on the penult whorl) 

 unequally spaced, very low and relatively coarse spiral striae. The 

 aperture is somewhat rhombic; columella thin, with a strong, short 

 plait. 



Length 1.9, diam. 0.6 mm.; 5| whorls. 



Type No. 3086, A. N. S. P. 



By Doctor Bartsch's key we bring this species into the subgenus 

 Evalea. The deeply excavated suture and somewhat coarser spiral 

 sculpture are differential characters, the suture, summit and general 

 shape of the shell agreeing with 0. santodoniingensis. We are there- 

 fore in doubt as to its subgeneric place. The columellar plait shows 

 fully only in a somewhat oblique view, as it recedes somewhat. 



Besides the tj^pe and a broken specimen, there is a larger shell, 

 length 2.2, diam. 0.75 mm., otherwise similar. 



Odostomia (Goniodostomia) superans n. sp. 



The shell is imperforate, oblong-conic, terminating in a very 

 obtuse summit. Embryonic whorls immersed. First visible whorl 

 is strongly convex, its initial part ascending. Following whorls are 



